and more
For some background information on Xorg's touchscreen handling, see this short article. The application is stable and with packaging support. Any help getting it in distributions is greatly appreciated, you can contact me at tias@ulyssis.org

Architecture

The calibrator consists of 2 possible frontend GUIs and currently has backends for the recommended evdev touchscreen driver, the (older) usbtouchscreen driver and for standard X.Org touchscreen drivers (like evtouch, mutouch, elographics, ...)

Because all existing calibrators were driver dependent and hard to use, xinput_calibrator was created.

Xinput_calibrator is based on a simple calibrator that was proposed on the Xorg mailinglist. The first release(v0.2.0) improved upon it by reading axis valuators from Xinput, hence making it generic for all touchscreen drivers. The announcement was done on the Xorg mailinglist, and the code is on Tias' webpage.

The new version (v0.4.0) writes Xorg.conf and (HAL) FDI policy file values, and contains a wrapper script to get axis valuator information for the evtouch driver (evtouch does not export the current calibration through its axis valuators). It is also the first program to support dynamic evdev calibration, by using its advanced Xinput functionality.

The v0.5.0 version is written entirely in the X window system, needing no external dependencies. Because of its modular structure, other frontends can be easily created too.

v0.6.0 contains many improvements suggested by different users, especially from the OE community. The most important changes are an autotools build system, debugging option, specific device selection, a manpage and much more (see Changelog).

Version 0.7.0 has mis-click detection and proper packaging support: proper make dist, one binary, has manpage, menu entry and icon. DEB and RPM package meta-data in their respective VCS branches.